how to get the amount in per hour.

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C#

i have an internet cafe so i want to create a timer for the shop.

this is my code and please can you help me on how to get the amount per hour or to compute for it. can you help me to have a better way on how to compute the amount in every 3minutes

thank you for the help...

private void timer_pc2_Tick(object sender, EventArgs e)
      {//to get the amount in every 3 minutes
          count_pc2 += 1;
          if (count_pc2 == 1800)
          {
              amount_pc2 += 1;
              lblamount_pc2.Text = "P" + " " + (amount_pc2.ToString()) + ".00";
              count_pc2 = 1640;
          }
          //count time
          diffA[2] = DateTime.Now - startTime[2];
          diffB[2] = new TimeSpan(diffA[2].Hours, diffA[2].Minutes, diffA[2].Seconds);
          this.lbltime_pc2.Text = (diffB[2].ToString());
          if (this.lbltime_pc2.Text == diff[2].ToString())
          {
              this.timer_pc2.Enabled = false;
              endTime[2] = DateTime.Now.AddMinutes(0);
          }
      }